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1.4 Terminology·What is ONT: Optical Network Terminal?
·Optical splits / splitter hubs?
·What is a BBU: Battery Backup Unit?
·What is FDH: Fiber Distribution Hub?
·What is FDT: Fiber Distribution Terminal?
·What is MoCA: Multimedia over Coax Alliance?
·What is NID: Network Interface Device?
·What is OLT: Optical Line Terminal?
·What is BPON or GPON?
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ONT: Optical Network TerminalAn ONT is a media converter that is installed by Verizon either outside or inside your premises, during FiOS installation. The ONT converts fiber-optic light signals to copper/electric signals. Three wavelengths of light are used between the ONT and the Optical Line Terminal: • 1310 nm voice/data transmit • 1490 nm voice/data receive • 1550 nm video receive Various models of ONTs are used by Verizon, depending on a number of factors: • Residential or business install (2 vs 4 POTS lines) • Interior or exterior installation • Multiple Dwelling Unit (MDU) • GPON or BPON equipped Central Office Each ONT is capable of delivering: • Multiple POTS (plain old telephone service) lines • Internet data • Video Your existing inside wiring for telephone, internet and video are connected to the ONT during installation. The following picture shows typical connections and status indicators at the ONT:
Click to enlarge
From left to right, RJ45 LAN connection, two POTS connections and coax connection
• Video is always on coax • Internet can be delivered over either coax or cat-5. Verizon's standard installation is coax from the ONT to the STBs and router.
A user asks, "Must the ONT be shielded against amateur radio RF power if it is near an amateur radio transmitting antenna?" BDF  says, "The ONT's required FCC certification for protection from radiated RF (as well as not radiating RF itself) should avoid the necessity for shielding. I do not have a problem at 250 watts, the ONT is about 30 feet from the transmitter, and about 40 feet from the closest part of the antenna. I run both horizontal and vertical polarization at different times, no issues."
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by drake edited by More Fiber
last modified: 2009-11-13 23:37:32 |
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A focal point for the main fiber feed in a neighborhood, or development, where the optical signals from a fiber link are split off to serve multiple customers over individual strands of fiber.
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by drake
last modified: 2005-10-16 17:03:11 |
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In addition to your ONT, your service has a Battery Back-up Unit (BBU) that is located inside your garage or house. In case your ONT is accidentally unplugged – or in the event of a commercial power failure – your back-up battery will provide you with power for voice service for up to 8 hours.
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by Kirby Smith edited by drake
last modified: 2005-10-17 01:48:50 |
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FDH: Fiber Distribution Hub
They are the beige boxes (pole or pad mount), that contain the optical splitters.
(from splicer2 's post here)
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by JTRockville edited by drake
last modified: 2005-10-16 19:41:04 |
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FDT: Fiber Distribution Terminal
The black objects where the drops that go to individual houses are connected. The terminals can go on a pole or underground depending on how your utilities are delivered. Most are 4-port terminals but they do come in different sizes.
(from splicer2 's post here)
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by JTRockville edited by drake
last modified: 2005-10-16 19:40:50 |
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The Multimedia over Coax Alliance (MoCA®), www.mocalliance.org, is an open, industry driven initiative promoting networking of digital video and entertainment through existing coaxial cable in the home.
See »www.mocalliance.org/en/industry/···ucts.asp for the complete list of MoCA products. Verizon supplied Actiontec MI424WR, and Motorola set top boxes (STB) are on the certified list.
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by grobinette edited by birdfeedr
last modified: 2008-12-05 11:26:10 |
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NID: Network Interface Device
A device that terminates copper pair from the serving central office at the user's destination and which is typically located outside that location.
In a FIOS installation with phone service, the installer will run a cable from the ONT to the NID in order to connect the POTS termination on the ONT to the existing inside wiring.
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by drake edited by More Fiber
last modified: 2009-08-07 01:53:07 |
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OLT: Optical Line Terminal
OLTs are located in Verizon's central switching office; this equipment serves as the point of origination for FTTP (Fiber-to-the-Premises) transmissions coming into and out of the national Verizon network.
An OLT, in a nutshell, is where the PON cards reside. The OLT's also contain the CPU and the GWR and VGW uplink cards. Each OLT can have a few or many dozens of PON cards.
PON = Passive Optical Network
GWR = Gateway Router
VGW = Voice Gateway
Each PON card transmits 1490nm laser data signal to the ONT, and receives the ONT transmission of the 1310nm laser data signal. The one-way 1550nm laser video signal to the ONT is injected into the fiber at the CO.
More details can be found by following links in this thread: »What exactly *is* an OLT?
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by drake edited by birdfeedr
last modified: 2009-04-12 07:42:48 |
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BPON: Broadband Passive Optical Network
GPON: Gigabit Passive Optical Network
FiOS networks are built upon Passive Optical Networks. BPON meets a standard which includes 622 Mbps download speed with 155 Mbps upload speed. Verizon typically splits a BPON fiber to 32 nodes, each simultaneously capable of 20 Mbps down and 5 Mbps up.
GPON is built on newer technology and is similar to BPON except that throughput speeds are higher. A 2.488 Gbps download speed coupled with a 622 Mbps upload speed, typically split to 32 nodes yields about 80 Mbps down and 20 Mbps up.
Verizon is building new networks with GPON technology, while existing BPON systems will only be upgraded when capacity limits are reached.
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by birdfeedr |
